The Yury Dolgoruky reference article from the English Wikipedia on 24-Apr-2004
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Yury Dolgoruky

Yury Dolgoruky (1091-1157), Great Kiev Prince 1149-1152 and 1155-1157.

A Russian prince, known as founder of Moscow in 1147.

Most of his life, however, was spent in numerous attempts to conquer Kiev throne (Kievan Rus), which he succeded in twice (in 1149 and 1155), but was never able to hold on to it for long.